In 1145, the German bishop Otto of Freising published his influential work of history and philosophy, the Chronica, in which he mentioned a Christian ruler of a domain far to the east. This priest-king had defeated the Muslims in battle and set out to capture Jerusalem, but had been unable to cross his army over the Tigris River.
This is the first-known written reference to Prester John, a significant figure in medieval Europe, despite the fact that he never existed.
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